Computed Tomography (CT) of the Temporomandibular Joint (TMJ) with Contrast

Published: August 9, 2026Updated: August 16, 2026

A CT scan using contrast to create detailed images of the jaw joint and surrounding bones.

Quick summary

["This test helps identify structural problems affecting the jaw joint, such as fractures, arthritis, or abnormal bone growth."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC: 87909-8
Short code: CT TMJ W contr IS
Synonyms: CT TMJ W contr IS
Category: liver
Sample: serum
Container: Red-top tube (SST)
Units: N/A
Fasting: false
Population: adult
Sex: all
Age range: 18–65 years
Method: ct
Specimen volume: 5 mL
Stability: Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max: 500
Lipemia max: 1000
Icterus max: 500
TAT: 4–24 hours
Order: routine

What is this test?

This is a CT scan of the temporomandibular joint, the hinge-like joint where the lower jaw connects to the skull. Contrast may be used to improve the visibility of tissues and blood vessels around the joint.

Why might I need this test?

A TMJ CT may be ordered to evaluate persistent jaw pain, clicking or locking, swelling, trauma, or suspected bone abnormalities. It can also help assess conditions such as arthritis, fractures, or abnormal bone growth.

How is the test performed?

You lie on a padded table while a CT scanner takes pictures from several angles. If contrast is required, it is usually given through a vein in your arm; the scan itself is generally painless and takes only a few minutes.

How do I prepare for the test?

Follow the imaging center's instructions, which may include avoiding food or drinks for a short period. Tell the care team about contrast allergies, kidney disease, pregnancy, or any prior contrast reaction before the scan.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Abnormal findings may include a fracture, degenerative or erosive joint changes, abnormal bone growth, inflammation, or a mass involving the joint or nearby tissues. CT is particularly useful for evaluating bony structures, although MRI may provide better detail of the joint disc, nerves, and other soft tissues. A radiologist will interpret the images, and your clinician will explain the results in relation to your symptoms and examination.

Short name

TMJ CT with contrast

Frequently asked questions

Is this TMJ CT the same as a routine dental CT?

No. A TMJ CT is focused on the temporomandibular joint and surrounding structures, often with contrast, while other dental CT protocols may image a wider area of the teeth and jaws.

Does the CT scan use radiation?

Yes. CT scans use a small amount of ionizing radiation, and contrast may also be used. The benefit and risks are assessed for each patient before the scan.

Will I need another imaging test for my jaw joint?

Sometimes. Your clinician may recommend an MRI if the main concern involves the joint disc, muscles, nerves, or other soft tissues that CT does not display as clearly.

Sources

1
MedlinePlus — Laboratory TestsSource
2
Lab Tests OnlineSource
3
Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy